You may want to ask your server admin to check the configuration and email address is there.
2nd thing to check is the site settings and make sure allow users to subscribe view is check marked.
You need to contact Tableau Server Admin for this I guess. That helped me when I faced the same issue
Configure the server to send subscription emails
- In the Tableau Server Configuration utility, click the Alerts and Subscriptions tab, and then select Enable users to receive emails for subscriptions to views.
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Have a look here Troubleshoot Subscriptions
I wonder if this might be your issue, as it would explain why you're sometimes seeing the icon (the responses above would mean you wouldn't being seeing an icon at all, and I didn't get that impression from your post)...
Thanks Donna. I changed everything to extracts and the button re-appeared. The weird thing is that I have the subscriptions button on other dashboards with live connections.
Check those Live connections, I bet they'll have embedded credentials.
They do have embedded credentials...just like this one had.
Huh, that is odd for sure. What happens when you now change one of those extracts back to a Live connection?
When I change back to a live connection, the button disappears again. This sounds like it definitely has to do with connector, more specifically, the Google sheets connector. Other live connections are tied to data sources stored on my Tableau Server.
Thanks for everyone's help