Hello,
If you log on to portal.office365, the portal will open with Office 365. You can then select Dynamics 365. What we sometimes see is that it will automatically load the Business Central while sometimes we would like to start Dynamics 365 for Sales instead.
The undocumented trick is the following. The pinned App will most likely have the following url set.
https://home.dynamics.com/?autolaunch=true
You can change that to:
https://home.dynamics.com/?autolaunch=false
In your scenario, this will probably open the sandbox. After copying the url in your favorite browser and opening the page, you can press Synch to synch the apps again. The sandbox will open via url:
https://businesscentral.dynamics.com/<guid>>/Sandbox/
The BC tenant will open via url:
https://businesscentral.dynamics.com/<guid>>/
If you do not add the last "/", IE, Edge, Chrome may not automatically add Sandbox to it. E.g.:
https://businesscentral.dynamics.com/<guid>>
Hope it does help you further. Note that if you use InPrivate / InCognito browsing to avoid stored cookies, etc.
