have you tried the "do not ask again’ check box? I seem to recall it asking, but i just tried then and it doesn’t ask me any more. try again and see if there is the check box so it doesn’t come up again.
Surely there is more than that which is an issue?
Probably because it is not selfhosted nor is it a web app??
Note, I use fossify calendar, but I still would like a self hosted web app calendar system