Re: Form is not submitting
@carrie-anne27 - only comment here is that I would avoid chaining the SubmitForm operation for the same data source as this can lead to inconsistent results (with Dataverse at least).
Along with the solution you have accepted, you can alternatively Patch the specific DataCards in those problem Forms:
Patch(
'Your Table',
'Your Record'
),
Form2.Updates,
Form3.Updates,
Form4.Updates,
{
'Field1': DataCard1.Update,
'Field2': DataCard2.Update
}
)