Outlook mail client and emails not being received

I recently got a new computer with a Windows 11 OS, and am using Outlook email client. I created about 10 webmail accounts---some Gmail and some outlook---and added them all added to my Outlook mail client, so all 10 or so emails would load each time I opened my email client. (Not sure if this is relevant, but I created separate passwords for each account, because I didn't know I could have created "alias" accounts.)
In any case, I am having a problem with my outlook email client, because every time I open it, a pop-up window opens which prompts me to create an "Hello" PIN for security.
So without knowing much, I decided to change some settings to stop this from happening.
The bottom line is that for several of my outlook webmail accounts, I cannot receive any emails and I fear I am missing some important emails, so I need some help to fix this.
I would really like someone to tell me what settings to check and to inform me what the correct settings should be, or anything else I should investigate, so that I can get my emails working again.
Any advice would be appreciated!
Thank you.