Hi,
You may request ability to provision to East US by creating new Service and subscription limits (quotas) request. To do this you can use link below to start the process:
https://portal.azure.com/#view/Microsoft_Azure_GTM/ModernBillingMenuBlade/~/supportrequest
Click Next to move to Additional details tab. Click Enter details, Quota type: Region access, Location requested: East US, number of cores you need, similar to below:
Save and continue and continue filling out case details and submit case. You should receive a confirmation email. If they don't grant your request you may consider deploying to East US 2 instead.
Please click Accept Answer and upvote if the above was helpful.
Thanks.
-TP