Noticed Error 400 Bad request in ADFS when trying to reach adfs services for authentication. ideally it happens if created CNAME record for ADFS Services. ADFS Will not support mapping the CNAME Record for the ADFS.
It is recommended to have A record for the ADFS. Once created correct record, restart ADFS services in ADFS servers and load the page and check. Hope you will get the page loaded without any issues.