Hey! Sorry to hear you're running into trouble. Here are a few things to check when emails aren't sending after linking a Microsoft account:

1. Ad blocker extensions - Disable any browser ad blockers, as these can interfere with the connection.
2. Organization security settings - If your Microsoft account is through a company or institution, your IT admin may need to approve Decile Hub as a trusted app. Some admins flag it as high risk and block it by default.
3. IP rejection - If you're seeing an error like "550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP," that's a Microsoft-side block that may require your admin to whitelist Decile Hub's sending IPs.
4. Verify the connection - Double-check under Settings > Integrations that your Microsoft account is fully connected and authorized.

Can you share any specific error message you're seeing? That would help narrow things down quickly!