As much as I love Enpass as a product it should not rely on the Microsoft store to work, this is a major issue and I can guarantee that 99% of Enpass users did not know that, and since it is sold as an offline solution its time to look for another option.
"Enpass Password Manager is currently not available in your account. Make sure you are signed in to the Microsoft Store and try again. Here's the error code, in case you need it: 0x803F8001"