I have two identical modems on my network each has its own ISP (BT)
They both run firmware 3.9.0
They both have Drayddns services activated.
They both show up in my MyVigor device list.
However one works well and under the service status shows a green flag (upgrade complete)

Upgrade complete
BPjM
Cyren
DT-DDNS 140 Days
DT-APPE

The other has a red flag (upgrade not complete

Upgrade not complete
BPjM
Cyren
DT-DDNS 139 Days

The upgrade not complete modem will not auto update when the Wan IP changes, but works if I force sync it.
My question is, do I need to unbind the device and start from scratch or is there some other way of completing the "upgrade"
There is no info on the Draytek sites to explain what is actually being upgraded!
Any help appreciated.

Shame that 2 weeks later nobody has a reply! Did you solve it yourself?

Regrettably I'm in a similar situation with a 2762.

MyVigor shows red flag and no DDNS update - even if I force it..

Has the 2860 been restarted?

I had an issue similar to this with DrayDDNS which disappeared after a restart.

And the obvious one is also to update to 3.9.1.

I think the upgrade being referred to is something internal but required a minimum firmware version. They sent an email regarding it, will have a search for it later.

To add to my earlier post.

The DrayTek emails were sent mid to late Match 2021 - Content below:

At DrayTek, your network security is of upmost importance to us, so we continually work at providing improvements. We do this by releasing updated firmware with security enhancements for all Vigor products, including updates to the MyVigor server.
We are in the process upgrading the system architecture for MyVigor, your devices will need to be upgraded to be compatible with the new system. We therefore require your help to complete the upgrade process by following the steps below. These steps need to be completed within 60 days or the WCF and DrayDDNS services may not work as expected after 2021-05-22.

1. Activate your account

Please click here or access the following URL to authorize the upgrading of your account to the new MyVigor server.
<Link removed>

This link is one-time available for the following 60 days, will be valid until 2021-05-22.

2. Upgrade your Vigor products to the latest firmware

Once your account is updated, your device(s) need to be upgraded for compatibility with the new MyVigor server, please upgrade your device(s) within 2 days.

Here are the device(s) registered to your account which need to be upgraded:

# Device Name Model Latest Firmware Version
1 2860VNPlus Vigor2860 3.9.0

Please upgrade your device(s) to the listed firmware version or above.

After finish these two steps, you have completed the upgrading process.

If you have any questions, or do not finish the upgrading process before 2021-05-22, please submit the support ticket through this page , or submit the issue to support@draytek.com directly.