Solved
Adobe Analytics Connector Loading custom fields for more than 15 minutes
I have refreshed the Adobe Analytics Connector in Google Sheets. I am doing this since many of the built in AA metrics are not displaying. Now though it has been more than 15 minutes and the Select metrics box still says Loading custom fields.
How long should this take. I ask as before this only took a minute or so.
Just for other users that find this topic - you can generally fix this with by re-authenticating the connector. If that doesn't help, then you may need to force refresh the account data - see this guide for all the steps:
https://support.supermetrics.com/support/solutions/articles/19000093552-not-all-accounts-segments-custom-fields-labels-are-showing-in-the-product
-Thank you
Supermetrics Team