Trying to add a coworker's inbound email account issue

I am trying to add the inbound email inbox for users, but I keep getting this when I reach the step where I need to select the folders :

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I made the user’s own External Personal OAuth Provider and connection,
I am following the tutorials here :

Try this video tutorial for email setup, and reply with your results!

The way it worked for me is this way :

having one personal OAuthProvider is all that matters, you then continue with these steps:
1- make the person an admin temporarily
2- log into the person’s account and then make the personal connection (use their outlook account as well)
3- make the inbound account using their connection, test by adding the monitored folders then add the inbox to the user
4- remove the admin permissions from the user
5- check in emails if the inbox got added

** DO LET ME KNOW IF USING THE SAME OAUTHPROVIDER IS NOT THE WAY TO DO THIS, I THOUGHT OF IT AS ACCESS TO THE API, BUT IF I SHOULD BE MAKING A SEPERATE ONE FOR EACH PERSON PLEASE LET ME KNOW AND WHY**

Thank you!

Why did you deviate from the steps in the video ?

Because it did not work if I was using the video’s steps

The video doesn’t cover OAuth, but @Ramez you are correct. You only need to set up a single Oauth provider and then everyone else can connect with that. That’s how I have done it as well.