Guest OS customization will fail if 'Guest OS Version' is selected as 'Debian GNU/Linux 10' or 'Debian GNU/Linux 11' in vSphere 7.0 releases

The guest ids of Debian 10.1x and Debian 11 are not in the customization mapping of ESXi 7.0 releases.
 

Guest OS customization on Debian 10.1x and Debian 11.x are supported in vSphere 8.0 release.

1. Power-Off the VM

2. Edit VM settings, select "Linux" for option "Guest OS" and select "Other 4.x or later Linux (64-bit) / Other 4.x or
    later Linux (32-bit)" for option "Guest OS Version"
    

Example:

•      Right click the VM and select "Edit Settings"  select  "VM Options"   select  "General Options"
•      For option "Guest OS", select "Linux"
•      For option "Guest OS Version", select "Other 4.x or later Linux (64-bit) / Other 4.x or later Linux (32-bit)"

3. Click "OK" to save the settings

4. Apply guest customization to the VM