I cannot find mac os catalina in app store
I'm trying to upgrade my mac os from mojave to catalina.
I couldn't find it on the app store.
As you can see in the picture, when I searched macos catalina, it is not on the list.
I tried a link from this page,
https://support.apple.com/en-us/HT211683
And it said, 'cannot connect to app store' on the redirected page.
How can I solve this problem and get mac os catalina?
Thanks.