Hi @Laura Kozel
If you're using Edge 109 version for Windows, there's a known issue when loading Power Apps in Edge 109. The Product Group is working on a resolution for this issue. I suggest that you can also provide feedback about this issue to Edge team by pressing Alt+Shift+I in Edge.
As a workaround, you can use the Enterprise Rollback Documentation to rollback Edge version to see if it can load in previous Edge version.
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Regards, Yu Zhou