Not receiving invitation for developer account

Hi to whom it may concern,

My company has hired an outsource to help us in developing our mobile app. But the person haven't received any invitation email to create developer account for their email company domain.

The outsource company has checked with their infra team, either the invitation email was blocked, but it wasn't. Is there any solution for this?

as summary my current company is inviting an outsource that used their company email to create developer account. but the email hasn't reached their end.

Not receiving invitation for developer account
 
 
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