Hi @anon349350 and Welcome to the Community !
I think you might have triggered some kind of preventive mechanism to avoid abusive use of the Sharing Doc feature β¦ At least, there seem to have been some questions about this when it comes to publishing and sharing a doc while on the free tier β¦
If, in the error message you get the suggestion to contact the support and share your doc with them, I think that the only way to solve this .
As @steph said in another topic regarding this question/problem :