Yes, your error message “Failed to create task” is different from the “Error creating cloud task” and is discussed in Codex Failing to Create New Tasks and Follow-Ups
In any case, it’s a good to have both errors logged in a thread for others to find as each requires a slightly different solution.
b.t.w., you don’t need to give COdex access to all repositories if you don’t want to. That was just my personal preference.