So I've finished up looking into this. Here is the simple to follow conclusion (trust me):

1: Every single President (except Biden) received a 21 gun salute IMMEDIATELY following their oath - Link to comment

2: The Presidential 21 gun salute is in a 3+1 gun configuration (three guns fire, one extra is reserved in case of failure), fired at 3 second intervals

3: 21 gun salutes are also given to foreign dignitaries - Table 3-1

4: Foreign dignitaries, such as Jordan's Secretary of Defense received one when visiting Arlington National Cemetary

5: As seen previous, that 21 gun salute was performed with a 2+1 gun configuration, with 9 second intervals

6: Biden visiting Arlington National Cemetery was the only salute he received

7: That salute was a 2+1 gun configuration, with 9 second intervals, same as with a visiting foreign dignitary

8: When Obama visited the Arlington National Cemetery, he receive the Presidential 3+1 configuration, with 3 second intervals

Ergo Ipso Facto, Biden was not recognized, and therefore not saluted as the United States President at the 'inauguration', and was received at Arlington National Cemetery as though he were a foreign dignitary.

So I've finished up looking into this. Here is the simple to follow conclusion (trust me):

1: Every single President (except Biden) received a 21 gun salute IMMEDIATELY following their oath - Link to comment

2: The Presidential 21 gun salute is in a 3+1 gun configuration (three guns fire, one extra is reserved in case of failure), fired at 3 second intervals

3: 21 gun salutes are also given to foreign dignitaries - Table 3-1

3: Foreign dignitaries, such as Jordan's Secretary of Defense received one when visiting Arlington National Cemetary

4: As seen previous, that 21 gun salute was performed with a 2+1 gun configuration, with 9 second intervals

5: Biden visiting Arlington National Cemetery was the only salute he received

6: That salute was a 2+1 gun configuration, with 9 second intervals, same as with a visiting foreign dignitary @14:10 minute mark, sorry I can't queue this one up for you

7: When Obama visited the Arlington National Cemetery, he receive the Presidential 3+1 configuration, with 3 second intervals

Ergo Ipso Facto, Biden was not recognized, and therefore not saluted as the United States President at the 'inauguration', and was received at Arlington National Cemetery as though he were a foreign dignitary.

So I've finished up looking into this. Here is the simple to follow conclusion (trust me):

1: Every single President (except Biden) received a 21 gun salute IMMEDIATELY following their oath - Link to comment

2: The Presidential 21 gun salute is in a 3+1 gun configuration (three guns fire, one extra is reserved in case of failure), fired at 3 second intervals

3: 21 gun salutes are also given to foreign dignitaries - Table 3-1

3: Foreign dignitaries, such as Jordan's Secretary of Defense received one when visiting Arlington National Cemetary

4: As seen previous, that 21 gun salute was performed with a 2+1 gun configuration, with 9 second intervals

5: Biden visiting Arlington National Cemetery was the only salute he received

6: That salute was a 2+1 gun configuration, with 9 second intervals, same as a visiting foreign dignitary @14:10 minute mark, sorry I can't queue this one up for you

7: When Obama visited the Arlington National Cemetery, he receive the Presidential 3+1 configuration, with 3 second intervals

Ergo Ipso Facto, Biden was not recognized, and therefore not saluted as the United States President at the 'inauguration', and was received at Arlington National Cemetery as though he were a foreign dignitary.

So I've finished up looking into this. Here is the simple to follow conclusion (trust me):

1: Every single President (except Biden) received a 21 gun salute IMMEDIATELY following their oath - Link to comment

2: The Presidential 21 gun salute is in a 3+1 gun configuration (three guns fire, one is reserved in case of failure), fired at 3 second intervals

3: 21 gun salutes are also given to foreign dignitaries - Table 3-1

3: Foreign dignitaries, such as Jordan's Secretary of Defense received one when visiting Arlington National Cemetary

4: As seen previous, that 21 gun salute was performed with a 2+1 gun configuration, with 9 second intervals

5: Biden visiting Arlington National Cemetery was the only salute he received

6: That salute was a 2+1 gun configuration, with 9 second intervals, same as a visiting foreign dignitary @14:10 minute mark, sorry I can't queue this one up for you

7: When Obama visited the Arlington National Cemetery, he receive the Presidential 3+1 configuration, with 3 second intervals

Ergo Ipso Facto, Biden was not recognized, and therefore not saluted as the United States President at the 'inauguration', and was received at Arlington National Cemetery as though he were a foreign dignitary.

So I've finished up looking into this. Here is the simple to follow conclusion (trust me):

1: Every single President (except Biden) received a 21 gun salute IMMEDIATELY following their oath - Link to comment

2: The Presidential 21 gun salute is in a 3+1 gun configuration (three guns fire, one is reserved in case of failure), fired at 3 second intervals

3: 21 gun salutes are also given to foreign dignitaries - Table 3-1

3: Foreign dignitaries, such as Jordan's Secretary of Defense received one when visiting Arlington National Cemetary

4: As seen, that 21 gun salute was performed with a 2+1 gun configuration, with 9 second intervals

5: Biden visiting Arlington National Cemetery was the only salute he received

6: That salute was a 2+1 gun configuration, with 9 second intervals, same as a visiting foreign dignitary @14:10 minute mark, sorry I can't queue this one up for you

7: When Obama visited the Arlington National Cemetery, he receive the Presidential 3+1 configuration, with 3 second intervals

Ergo Ipso Facto, Biden was not recognized, and therefore not saluted as the United States President at the 'inauguration', and was received at Arlington National Cemetery as though he were a foreign dignitary.