It seems that dynamic dns service from tplink is not supported

Domain: b612.tplinkdns.com
Type: None
Detail: DNS problem: query timed out looking up A for
b612.tplinkdns.com

my qeustion is: it’s supposed to work, and it doesn’t, or it isn’t supported?

https://mxtoolbox.com/SuperTool.aspx?action=a%3Ab612.tplinkdns.com&run=toolpage
resolution works, even on google dns 8.8.8.8

tplinkdns.com uses buggy, noncompliant DNS servers. Let’s Encrypt is not blocking them, but it may or not may not work unless TP-Link fixes their DNS software. You’re lucky that 8.8.8.8 can resolve some things.

https://community.letsencrypt.org/search?q=tplinkdns.com

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