Unrecognized database format filename.accdb

Anonymous it may be related to powerbi upgraded version. some time, new version has upgraded connector which causes such issues.

If you're connecting to an Access database from Power Query Online, the system that contains the on-premises data gateway must have the 64-bit version of the Access Database Engine 2010 OLEDB provider installed.

If you're loading an Access database to Power BI Desktop, the versions of the Access Database Engine 2010 OLEDB provider and Power BI Desktop on that machine must match (that is, either 32-bit or 64-bit). For more information, go to Import Access database to Power BI Desktop.

 

have you tried below link

https://docs.microsoft.com/en-us/power-query/connectors/accessdatabase

 

https://docs.microsoft.com/en-us/power-bi/connect-data/desktop-access-database-errors#:~:text=If%20the%20Power%20BI%20Desktop,Engine%20from%20the%20downloads%20page.

 

Alternatively, you may try creating ODBC DSN connection string