BackUpWordPress wp-cron.php SSL: certificate subject name error

We have installed BackUpWordPress on 3 of our WordPress sites. Ever since our website has been changed to run on HTTPS, the following message has appeared, and our scheduled backups have stopped running as a result:

“BackUpWordPress has detected a problem. wp-cron.php is returning a SSL: certificate subject name ‘*.XXX.co.uk’ does not match target host name ‘YYY.com’ response which could mean cron jobs aren’t getting fired properly. BackUpWordPress relies on wp-cron to run scheduled backups. See the FAQ for more details.”

I have looked at the FAQ but cannot see a suitable fix.

Is there any fix you can advise on?

https://ww.wp.xz.cn/plugins/backupwordpress/