Are you still running into an issue? Usually if it’s just refreshing, you’re either losing the post data or you have a cookie issue. See if this helps: https://docs.expressionengine.com/latest/troubleshooting/general.html#submitting-a-form-has-no-effect-and-the-page-simply-reloads
If it’s not a rewrite losing the post, look at your headers- see if it’s trying to set a cookie and can’t.
You might even ftp in and set an override so the cp using a session id and not cookies- see if that gets you in:
https://docs.expressionengine.com/latest/general/system-configuration-overrides.html#cp_session_type
$config['cp_session_type'] = 's';
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