Slido is not connecting to my powerpoint as it says I need to switch to an account with access

Hello ​@Julia de Man 

could you please share with me a screenshot of that error here? Most probably I assume that your presentation was connected already with a Slido of some other account.

If that was a case the solution is copying all of powerpoint slides without any Slido slide and pasting them to a new presentation. That should allow you to connect it with your Powerpoint.