Users in Multiple Groups

Hi,

I have a Powerapp that was displaying an error. 

"Unable to patch to datasource.  Either datasource is read only or there is no primary key"
I'm in the same group as other users and in two groups.  These groups have different permission levels

One did have Add and View.  I changed this to Contribute.  The error message went away and I could submit the form and patch the record.  Other uses in the same group could not perform the task??

Just really do some process of elimination.  If people are in two groups do the groups need to have the same permission levels or does the lower permission level become the primary level??

Hope that made sense