Use your Regency account.
Off-site sign-in needs your authenticator code. No code set up yet? Ask the office to open a setup window for you.
The 6-digit code from your authenticator app. A recovery code works too.
Scan this in your authenticator app (Microsoft Authenticator, Google Authenticator, 1Password…), then type the code it shows.
No apps are shared with you off-site yet. Ask the office if you think something's missing.