Unable to select sharepoint site from dropdown

[lalondesteve]

Somehow, there's some places that I can insert a custom url and that works, but some other places, not. 

See picture 

I've seen this mentioned a couple of times and either there's no answer or people failed to see the possibility of custom input. (And no, there's no special character). I checked the permissions and even made sure the site was added in the flow's connections. 

Mystery

EDIT: found this post https://powerusers.microsoft.com/t5/Building-Flows/Can-t-invoke-Flows-from-SharePoint-Online-dropdow...

This is concerning. 

[askondo]

@lalondesteve 

As far as I can tell, the "Send an HTTP request to SharePoint" action is working for the site you entered by custom value.
Is your problem with the "Send an HTTP request to SharePoint" action not working for all site you entered by custom value.?
Or is a particular site not functioning?

[lalondesteve]

@askondo 

It's not working, it doesn't let me enter the custom value for this field and instead gives me the error message shown in the ss. 

If I press enter, nothing else happens. It only works for the sites in the list, which are useless.