Try to alt+ctrl+delete and see if access is running in your task manager.

Kinda fits along with Access Bug Alert!

I have tried alt+ctrl+delete and still get the error - You attempted to open a database that is already opened by user <name> on machine <name>. Try again when the database is available. (Error 3704). I have googled error 3704 there are all kinds of info. I have tried my things to fix the problem. No success.

Have you checked if you have an laccdb file in the folder with your database that didn't get deleted when you closed? It's usually a 1kb file.

I just viewed the Access Bug Alert video. I will make the recommend changes and see if this fix's my problem. Thank you

Access for Microsoft 365
Last Updated: February 4, 2022
ISSUE
A bug in Current Channel Version 2201 (Build 14827.20158) has been reported that prevents Access from closing and leaves the lockfile active, which may lead to the following errors even before shutting down Access. The issue is triggered by running VBA code that references Access objects.
Symptoms include:
&#61607;No Access window open, but Access process running in task manager
&#61607;Trying to compact and repair an Access file and receiving a message that the database is already in use
&#61607;Receiving 'Error 3048: Cannot open any more databases'
&#61607;Receiving 'Error 3014: Can't open any more tables'
&#61607;Receiving error 'Already in use by Admin'
STATUS:   WORKAROUND
We have identified the issue and the VBA team has created a fix. This fix will be deployed as soon as possible.
To work around this issue, put your database in a trusted location.
Note: This workaround will not work if AMSI (Antimalware Scan Interface) is enabled for all documen

Microsoft posted a fix for this yesterday.

Thank you.