Bookings with me we could not fulfil your request.

Hopefully this will be of some use to someone - We came across this error and, on seeing these threads, asked our admin to take a look at the settings in Microsoft 365 Admin Center -> Settings -> Org Settings -> Bookings. As soon as the admin just looked at the settings page and didn't change anything (I was on the screen share - can confirm!) the issue seemed to resolve itself. We already had Bookings turned on.

This was an initial investigation into the functionality so we won't be using it heavily until a few months away so I can't say it has resolved 100% but after 3 or 4 tests using the same process (but different email addresses, browsers, networks etc.) we have been unable to recreate the error.