Same same issue here
Moved to Google domains. Got a cheap domain and enabled dynamic DNS for a subdomain.
To keep your Public IP up to date: Hass Integration - Google Domains
Installed the LetsEncrypt Addon, and get a cert with the HTTP challenge.
All good now. Good bye DuckDNS, was a good 3 months 
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Same problem. Google Home was malfunctioning due to sync issue.
Now I have migrated to no-ip, free version at the moment and 0 problems.
I have also migrated the SSL certificate with them, you have 1 free.
I just hope duckdns fixes itself - had no issues for 18 months, Really donāt need the hassle of setting up something new for the 5 sites I use it for
Iām in the same boat, donāt want the hassle of migratingā¦ but if a multi-day outage can occur once itāll probably happen again. Also find it strange DuckDNS doesnāt have any comms on this.
Its a free service and really cool it existed, but I think Iām going to switch to cloudflareā¦ as I was always thinking it might be better for response time and security.
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Iāll give it a week or so before I look at other methods/services. Luckily I still have the OpenVPN to my local but my widgets on my phone for entities that use the service donāt work.
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I just create a domain with google domains, do you know if itās possible to use swag with google domains? and another question, what kind of authentication did you use with letās encrypt DNS or HTTP?
Anybody migrate their google assistant app. Any tips smoothly moving that over to a new domain, or is it worth setting it up by scratch?
Same here for the last few days - been pulling my hair out and restarting/updating (probably making things worse).
I guess Iāll wait for this to be fixed by duckdns 
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I had the same issue. I switched to Cloudflared.
This has the advantage of the default Cloudflare integration (ddns, waf, etc.) but it also creates a Cloudflare tunnel, so no more ports to forward in your router!
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Is there an lxc proxmox cloudfare helper script? I donāt use addons - only lxc containers.
Might have a look into it - thanks
possibly this one-
https://hub.docker.com/r/cloudflare/cloudflared
Have you got google home working with Cloudflared?
Iām not using Google Home at the moment. But I could give it a try, just to check.
But one user on Github is reporting that it is working for him.
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I havenāt switched to cloudflare because they donāt allow high traffic like video through plex. Amy other alternatives other than my own domain with LetsEncrpyt?
@everyone it seems i hot my connection back at Google home and control everything again with my voice!
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duckdns seems to have stabilized here, no outages for about an hour.
Fingers crossed
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Same here, itās working again. But given the duration and severity of the issue, i donāt want to rely on duckdns anymore in the future. Itās not stable enough for what I expect in home automation.
Therefore, iām considering the clourflare solution as described here: The Easiest Free Way To Do Home Assistant Remote Access! - YouTube
Does anyone has experience with this solution?
Anyone had luck with freedom?
I got stuck at this point after creating a domain with freedom and account with cloudfare setting up the cloudfare integration:
Unusable TLDs
Due to a limitation in the Cloudflare API, you can not use this integration with any of the following TLDās:
.cf
.ga
.gq
.ml
.tk
Freenom only issues these so as far as I can see freenom will not work on HA following the youtube instructions
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I switched over to DYNU ddns, it creates certificates and all runs smoothly, but the official addon needs a download from github, an edit in some files and a local installation, duckdns is really shaky so even if temporary you need a solution to swap to.
Both alexa and google setups (without nabucasa) require simple steps to update the links but not easy to find, still need to open the tutorial on youtube to pinpoint the links location for each: Alexa needs both aws and alexa consoles accessed, google only the action console, ofc you need to reconnect each skill, but that is about it, I was also scared it would be much more action but it can be done in under 1h even with distractions once ddns is up and running with certificate .
PS: it seems duckdns gets flagged more than others for phishing, I had a warning on my page that google later removed, but it happened at the same time other duckdns problems were probably happening, I got google to review and remove the warning, super fast incredible, but when they sent the email confirming duckdns was already hours full dead so I started to change the duck, hope they recover and not everyone needs to swap but I would not risk it, have another ddns on the ready, installation is not always just a click sadly, I did not try cloudflare, if it works out of the box use that.