Paul - 2021-05-19

WebDav credentials are stored in KeePass.config.xml, which is usually in the %APPDATA%\KeePass folder - unless you use the portable version or a plug-in to access the WebDav server.
Check that the credentials are listed in that text file.

Note: The config file is rewritten every time you close KeePass. Does the change happen between closing KeePass / rebooting?

There is no 32/64 bit version, you get whatever bittedness matches Windows.

cheers, Paul