We are unable to find the site address. Please try selecting a site address from the dropdown.
Does anyone have any insight on this error? I can Copy a step from an existing flow and it works, but I cannot create a new step in either a new or old flow.
Power Automate even knows that the URL is correct because in the following step it shows me all of my available lists:

In case it helps, I actually don't get a list of SP sites for Step 1. I've always had to enter a custom value.
As a workaround, I have been going into old flows and copying the components that I need... This just seems silly, and it's very inconvenient.
Checked out these as top results. No solution found.
Troubleshooting Steps Performed:
- Verified Account has Site Permissions
- Created new flow from scratch
- Added a new step to an existing [and working] flow
- Entered URL ending with /
- Entered URL ending without /
Yes...
- The URL is definitely correct. I have many working flows that I can copy-paste the URL from; and
- I definitely am pressing 'Enter custom value'