We have integrated different planners for the "External user" groups.
For example, we have created the two user groups as Sales and Buying and created the planner as Sales and Buying.
We have assigned separate groups for each planner.
But while we access the SharePoint it shows both planner to all external users, also shows the following error:
You no longer have access to "a67a06ed-f4bf-4147-9575-24df18a9d786".
How to solve this issue and provide the particular external user access with the appropriate planner.