This error message comes from Oracle, so it's likely that the problem will have to be resolved at the Oracle side. Often you get a further, more detailed error from Oracle, but this doesn't seem to be the case here.
Do you define a trigger within your Oracle DB or the specific table within your Oracle DB? If yes, please consider take a try to remove the trigger from your Oracle DB or Oracle table, then re-create a connection to your Oracle data source from your app, check if the issue is solved.
Note:Currently, within PowerApps, we could not create a connection to a Oracle data source which has configured Trigger within it.
In addition, you could also consider take a try to re-create a new database within your Oracle, then create a new table within it. Re-create a new app, then create a connection to your new Oracle DB, check if the issue is solved.
Community Support Team _ Kris Dai If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.