According to Asobo, this issue was caused by a cache that was overloaded and constantly restarting. This was used in part of the authentication process, I believe when they check what content you have. This explains why people had missing content if they were lucky enough to get in. This was my experience - got in after a very long load time and then couldn’t really do anything due to missing content.

This doesn’t seem like it’s a Microsoft cloud issue per se, it seems like Asobo had a single point of failure in the design that didn’t scale well. Today seems like the CDN limits are finally being reached, as it took a while to load up new areas. Getting into the game was no issue, though.