Getting contradicting errors in script made to edit feature class using ArcGIS Pro

Why can’t I edit in ArcGIS Pro?

The following are known causes for this issue: The editing capabilities of the layer is not enabled in ArcGIS Pro. The layer is corrupted or broken. The user is not logged in to an ArcGIS Online organizational account in ArcGIS Pro.
 

How do I edit a feature class in ArcGIS Pro?

Modify features

1. On the Edit tab, in the Features group, click Modify .
2. To show tools that perform specific edits, type the name, category, or part of a name in the Search box .
3. Edit the feature following the steps prescribed by the specific tool.
4. To finish the feature, right-click and click Finish.

How do I fix error 999999 in ArcGIS?

Troubleshooting Error 999999 in ArcMap and ArcGIS

1. Restart ArcMap/Your Computer.
2. Try the operation in a blank map document or in ArcCatalog.
3. Check your input and output workspaces.
4. Check the names of your inputs and outputs.
5. Disable Background Geoprocessing.
6. Check your projections/coordinate systems.