I have the same problem.
A few months back, I created an Instagram account with a Gmail id. Recently I decided to start a FB business manager account with the same ID. I created a new account & then the business manager acc, just updated the name. I logged back in the next day to finish setting up the account & I get a message that it has been banned/deleted or something. While appealing for a review, It asked me to provide a profile pic & a govt issued ID too, I hesitantly uploaded the ID & I get a response saying I have been banned & cannot create the account. No other reasoning was provided.
The insta acc still works. I wanted to connect both accounts & advertise using that, but now I cannot. 😶