Can you please put all questions or queries you have about FM Online in this thread and that will free up the main forum for Clan threads or game threads,
Here is a post by vara which I hope may help solve some of the problems people may be having when it comes to playing FM Online. Please give it a go.
1. delete preferences and cache from C:\Users\*User*\AppData\Local\Sports Interactive\Football Manager 2020 - you will need to turn on hidden files to see this.
2. load the save, go into online preferences and set server visibilty to 'Anyone'