Hi @itwcreativework,
Happy to help! Please find my responses below:
Debug IDs - When you're trying to create the application and receive "Something went wrong, please try again later" you'll notice that the URL has changed to include an ID. You can provide that entire URL in the ticket and the agents should be able to use that to track the issue.
Vault Functionality - For both Sandbox and Live, when creating a new app for REST API the vault functionality should be automatically enabled <see screenshot below>. You shouldn't have to select anything when creating a new app to enable this feature.
Christina
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