Trouble sharing federation in circles

Nextcloud 19.0.1
Ubuntu 20.04
PHP 7.2.32-1 + ubuntu20.04.1 + deb.sury.org + 1
/ I know, I know - it’s temporary and doesn’t seem to affect this problem /

I’m having trouble federated sharing with circles.
That is, it only works for certain names - for example “test” always works, but many others don’t. This in itself is a big problem.
But, dealing with this problem on both federation clouds, I was deleting and creating circles and shares, so far as I had uninstalled circles, I manually purged all oc_circle * tables from all data. It didn’t work, I keep getting Federated Cloud ID error.

Additionally, now after executing files: scan -all I get this message: /
How do I get rid of it!

Exception during scan:

#0 [internal function]: OCA\Files_Sharing\External\Storage->checkStorageAvailability()
#1 /var/www/html/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php(507): call_user_func_array(Array, Array)
#2 [internal function]: OC\Files\Storage\Wrapper\Wrapper->__call(‘checkStorageAva…’, Array)
#3 /var/www/html/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php(507): call_user_func_array(Array, Array)
#4 [internal function]: OC\Files\Storage\Wrapper\Wrapper->__call(‘checkStorageAva…’, Array)
#5 /var/www/html/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php(507): call_user_func_array(Array, Array)
#6 /var/www/html/nextcloud/apps/files_sharing/lib/External/Scanner.php(90): OC\Files\Storage\Wrapper\Wrapper->__call(‘checkStorageAva…’, Array)
#7 /var/www/html/nextcloud/apps/files_sharing/lib/External/Scanner.php(45): OCA\Files_Sharing\External\Scanner->scanAll()
#8 /var/www/html/nextcloud/lib/private/Files/Utils/Scanner.php(260): OCA\Files_Sharing\External\Scanner->scan(’’, true, 3)
#9 /var/www/html/nextcloud/apps/files/lib/Command/Scan.php(151): OC\Files\Utils\Scanner->scan(’/lukasz.bartcza…’, true, NULL)
#10 /var/www/html/nextcloud/apps/files/lib/Command/Scan.php(207): OCA\Files\Command\Scan->scanFiles(‘lukasz.bartczak’, ‘/lukasz.bartcza…’, Obje
#11 /var/www/html/nextcloud/3rdparty/symfony/console/Command/Command.php(255): OCA\Files\Command\Scan->execute(Object(Symfony\Component\Console\I
#12 /var/www/html/nextcloud/core/Command/Base.php(169): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\Arg
#13 /var/www/html/nextcloud/3rdparty/symfony/console/Application.php(1012): OC\Core\Command\Base->run(Object(Symfony\Component\Console\Input\Argv
#14 /var/www/html/nextcloud/3rdparty/symfony/console/Application.php(272): Symfony\Component\Console\Application->doRunCommand(Object(OCA\Files\C
#15 /var/www/html/nextcloud/3rdparty/symfony/console/Application.php(148): Symfony\Component\Console\Application->doRun(Object(Symfony\Component
#16 /var/www/html/nextcloud/lib/private/Console/Application.php(215): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console
#17 /var/www/html/nextcloud/console.php(100): OC\Console\Application->run()
#18 /var/www/html/nextcloud/occ(11): require_once(’/var/www/html/n…’)
#19 {main}