version history
2021-07-26 NAV BC documentation started to warn, that Approxy is not supported because websockets issue https://github.com/MicrosoftDocs/dynamics365smb-devitpro-pb/commit/eea46706ca0b977630b3c40fced5ad69…
2021-12-17 Entra Approxy documentation started stating, that it is supporting websockets, with minor problems https://github.com/MicrosoftDocs/entra-docs/commit/9c11ae279c0ef5f1afdc8dfb80d8d3051376d6d1
in years later some people reported on various forums, that they cannot get past login page: loading wheel spins forever. Probably approxy websocket issue
now seemingly working, but not confirmed by MS and undocumented