Problems with downloads from hotmail

Hi,

I currently use fetchmail 7.0.0-alpha13 running on Fedora 42 to pull 
emails down from hotmail with OAuth2 and delivery to my local dovecot 
email server.

Up until the last few weeks I've not had any issues with downloading 
emails, but now I've started having an issue where an <feff> character 
gets inserted just before the start of the main header (so after the 
local part inserted by fetchmail).

My fetchmailrc file is along the lines of:
poll pop-mail.outlook.com proto POP3 port 995 auth oauthbearer username 
"[email protected]" passwordfile "fetchmail-token" is "user" here 
nokeep fetchall sslmode wrapped sslcertck

Anyone got any ideas/suggestions?

Thanks,

Ian