Moin 
I had to renew my certificates (gigi-home - nc, wiki, matrix)
On the machine is a cronjob for “certbot renew”.
I lately received a mail for my expiring certificate.
Today I did this manually and it shows this symptoms:
first run - first object returned successful, the other two failed
second run - skips the first, second object success, third object failure
third run - skips both first and second, third object success
Error message - Failed to renew certificate with error: Some challenges have failed.
I seems like I have to set an option in security settings which lets you work on them in a row, but I down’t find the point where to set up in Cloudflare.
Anyone has an idea?
Greets,
Luis