Hello
I am afraid I don't have an answer right away but need to gather more information first.
After you changed your email, can you sign into www.outlook.com online via web browser? Can you receive emails there?
If not, can you tell me, does sender receive a bounce back undelivery notice?
If you go to https://account.live.com > Microsoft storage, is your storage full?
If you go back to www.outlook.com > Gear icon (upper right), go to Settings > Mails, can you go through these items:
Rules
If any rules are listed, delete all of them.
Conditional formatting
If anything is set up there, delete it.
Forwarding and IMAP
If you see any entries or settings you did not create, remove them. Turn off POP and IMAP.
Junk
Review Safe sender and blocked list. If you don't recognize any, remove them.