Please update to support Epson scanner type L 350

It is up to Epson to provide support for your scanner in macOS Big Sur 11.6.

Have you gone to the Epson support page for your product and downloaded the

required software and drivers and installed them.

Which country are you writing from, I'm in the UK and the Epson UK website does not list the L 350

click on the link below and then select your country.

https://epson.com/?_re=1

From there you should connect to the appropriate Epson support page for your scanner,

enter the scanners model identifier L 350, make sure you select the correct operating system

you are using, then you should then be presented with the available software and drivers,

click on the + signs to reveal the download buttons.

Once downloaded, install the items.

Restart you mac and see if you can now use the scanner.

In this thread it's addressed a compatibility issue with Epson L355 (which, I guess, is similar to your model) and Big Sur:

https://discussions.apple.com/thread/252192355