Server running ubuntu-20-04-lts via Vultr.

We have installed phpmyadmin on a couple of servers. When opening phpmyadmin in the browser, we see a lot of error messages already on the login page. And when logged in there's also a lot of error messages that say that phpmyadmin is not set up correctly.

For example:

 Return type of Twig\Node\Node::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice

When opening a database we only get server error 500 and the tables are not displayed.

Deprecation Notice in ./libraries/classes/Util.php#3347
 Function strftime() is deprecated

Backtrace

Header.php#652: PhpMyAdmin\Util::expandUserString(string '@HTTP_HOST@ / @VSERVER@ | @PHPMYADMIN@')
Header.php#468: PhpMyAdmin\Header->getPageTitle()
Response.php#323: PhpMyAdmin\Header->getDisplay()
Response.php#353: PhpMyAdmin\Response->_getDisplay()
Response.php#493: PhpMyAdmin\Response->_ajaxResponse()
PhpMyAdmin\Response->response()

Is this a known problem? I've searched everywhere, and I can't find others with the same issue.