I’ve created an add-in that consist of a ribbon and three tabs. Background to build: The ribbon is built using designer and not xml. The primary use of these is to allow quick opening of various email templates. Tab0 adds a couple buttons to the built in TabMail Tab1 is a new custom tab with various buttons that do various things. Tab2 is a reduced version of Tab1 for use by users of our subsidiary company but pointing to alternatively branded templates. In the coding, Tab1 and Tab2’s visibility is set based on user AD group membership on ribbon load event. This has been tested and works. Tab0 always is merged with the built in Home tab shows as expected.
Developers and template admins like me should see all tabs. This also works using same methods.
Current issue: Recently and I think after a certain office 365 update (but not 100% which), Tab1 no longer shows for anyone that should see it on load. However the tab has loaded somewhere. The reason I know this is because to fix this bug all I have to do is minimise the ribbon the re-maximise. Both additional tabs are instantly visible.
Please note, I do not have to disable and the re-enable the actual add-in.
I can also confirm that the Ribbon Type is set correctly (Microsoft.Outlook.Explorer) so please, no reply along those lines either.
I have trawled the web and cannot seem to find an explanation or fix for this behaviour. I'm hoping someone has seen this before and might point me in the right direction.
To replicate, I've seen it happen by just creating a new simple ribbon project and creating a new custom tab. Then create a second tab by copying the first, giving it a diff ID.
e.g. Ribbon on App Launch/Load - Tab01 Missing
