The model [App\Models\Button] does not have a relationship named [agency]. You can change the relationship being used by passing it to the [ownershipRelationship] argument of the [tenant()] method in configuration. You can change the relationship being used per-resource by setting it as the [$tenantOwnershipRelationshipName] static property on the [App\Filament\App\Resources\ButtonResource] resource class.
The model [App\Models\Button] does not have a relationship named [agency]. You can change the relationship being used by passing it to the [ownershipRelationship] argument of the [tenant()] method in configuration. You can change the relationship being used per-resource by setting it as the [$tenantOwnershipRelationshipName] static property on the [App\Filament\App\Resources\ButtonResource] resource class.