Dear Morgan Ray (Admin)
Good day! Thank you for posting to Microsoft Community. We are happy to help you!
Based on your description, I understand that you have a concern with “Sorry. we can't load the add-in. Please make sure you have the network and/or Internet connectivity. Click "Retry" once you're back online”. and in order to help you better, I still need to gather more information to narrow down the problem:
- Please kindly share the complete screenshot which includes error information and error code with me so that I can do further research.
- If you are using Outlook Desktop Client, would you like to try logging in to OWA (Outlook web app)with your account to check whether you got the same error?
- What type of work account do you have?(business account/outlook.com/hotmail.com/pop account/imap account) Or what subscription information are you using?
- In addition, please also check whether your outlook desktop client has updated the last version, if not please kindly update it and then check the result.
- Basically, If your add-in fails to load within an Office client, it's most likely because local firewall software, VPN software, proxy settings, or Metered Connection settings are preventing access to the URL, or it might be because you haven't installed (trusted) the certificate because Office clients require add-ins and webpages to come from a trusted and secure location.
- Is your problem with a custom add-in or a normal add-in? If it's a normal add-in, what exactly is it?
In the meantime, please kindly provide me with the above information I need to give me further research, thank you.
Thanks in advance for your understanding! Your patience and cooperation will be highly appreciated. Hope you all the best!
Sincerely,
Kerry Chen | Microsoft Community Moderator