Errors when sending or receiving email in Outlook.com or Hotmail

hi, the problem is, i am not receiving emails, i had a friend send an email and it was noted as undeliverable. if i try to send one it just stays in sent file and not reported as undeliverable. i have changed password gone through the unblock procedure, deleted old emails to clear space. i can log in ok but cant send or receive emails.

I can't provide you with a screenshot but it's an error 550.

It happens when I send an email to any recipient.

It started 3-4 days ago.

Some with an attachment, some without. Even simple test emails will not send.

Multiple people have sent me emails that I do not receive. Since these emails are also going to my husband and he can see my email CC'd I know the sender is using the correct email address. I do not have the senders blocked and there are no filters.

The issue is that OTP are not been received from Amazon and having spoken to Amazon they suggest the codes are being sent and just not received, I had no issues until today with a new PC and all was good on win10 yesterday and now running win11 on new PC, I loaded and signed into my Hotmail account and other messages I am aware of are being received