Hi @David Johnson,
To help investigate why your Microsoft Forms profile is still stuck on en‑us even though all of your tenant, user, SharePoint, and browser settings are set to English (UK), I will need a little more information, could you confirm these following:
1/ Are all new Forms stuck in the US date format, or only specific forms you created recently?
2/ Does this behavior occur across all browsers, including private/incognito mode?
3/ Does the issue happen to other users in your tenant, or only for your account?
4/ Have you recently changed your region or language settings, or has this been stuck for a long time?
5/ Are you accessing Forms through forms.microsoft.com, or through another entry point such as Teams or OneDrive?
6/ When you check your Forms profile from the top‑right account menu, does it display the correct region, or does it still show US?
7/ Regarding to the tenant, is your tenant managed by another third-party organization (e.g. GoDaddy) or can you still log-in via www.admin.microsoft.com?
8/ Are you a Global Admin in the tenant?
In the meantime, you can try to contact Microsoft support via phone by following list of phone numbers available on this page: Customer service phone numbers - Microsoft Support.
Note: Please understand that as a forum moderator, my primary goal is to provide helpful guidance and support through general troubleshooting steps. While I don’t have access to internal systems or test devices required to resolve backend/account issues, I truly appreciate your understanding of these limitations.
I hope you find this information helpful. If anything is unclear, please don’t hesitate to reach out to me.