CIRCLES won't accept any changes ! blocked

my nextcloud has a valid address and is used by several members of our team.
I need a valid circle, do you know which kind of address should be given for the loop?
localhost didnt work, my URL didn’t work, do you have another view on this please?

You need to use an address of your Nextcloud that is reachable from the hosting server itself. if the current one of your nextcloud is not working you will need to make it works through your httpd configuration.

every other service is using localhost (db for instance).
circles worked fine for several months. I guess it stopped after the .7 update or so.

I’m sorry to insist but I don’t understand yet what address or type of address I should use neither where I should have it copied.

wd u have any info, any link i could use in order to fix this please?
thanks