Hello @Kateryna this error usually indicates that there are some errors on the server part. Currently, from the Atlassian status page, everything is operational for Jira. Try with incognito mode as well.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
When you click on Statuspage, do you get additional info?
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
Is your account only affected with this issue or there are more users being affected with this issue?
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.