Can't add card - lovelace

Hi,
I’m trying to add card to my lovelace front end and can’t get it to work.
The loading indicator keeps spinning and I can’t save any changes.
I tried setting the configurator to use ui-lovelace.yaml and reverted back and removed the ui-lovelace.yaml but still can’t .
Also I run into the same issue when trying to create automations, I can define the automation but can’t save it.
Any suggestions?

Thank you,

It seem this issue is now only happening when accessing through the DuckDNS, if I log locally using the IP then I don’t have issues…

Having the same issue and confirmed that saving is working I access via a local address. It’s probably a firewall issue but what?

Just clear the cache and cookies of your browser, this will clear this problem.