M&T Bank site breaks during login procedure

When trying to log into M&T Bank website at https://login.mtb.com/a/digitalbanking/login/ I am unable to complete the login process.

EXPECTED BEHAVIOR: To log in to the M&T website

WHAT’S HAPPENING: After entering username and password I’m taking to my choice of MFA options, either code by email or code by text. Either option, once selected and pressing button “Send Code”, I’m taken to an HTML error page. The security code is still sent, because I receive it.

WHAT I’VE TRIED: Disabling all shields, open inside incognito. Chrome browser works fine.