It looks to me they suspect your account to be compromised, and want to re-confirm who you are.
Altho a hassle, it's a standard procedure.

Some services I used i had to re-KYC 3-4 times in the past few months, before while traveling for work, i was logging in from different countries.
Your IP might have just been flagged before by a different user, who knows

Thanks for your reply,

The account has no security issues or failed login attempts.

The IP issue I also suspect caused this to an extent because I use an OPEN VPN to hide my IP and prevent hacking or man in middle attacks.
Lots of people do or should for this reason trading crypto. If the IP issue tripped s flag, then any logical person could figure many email accounts
would also use the same IP from a free VPN business and that should not force blocks on everything when they already have my KYC submitted and accepted.