Nobody has replied so i will.
You want help, but haven’t included even the faintest hint of your system specs, what other software is running, what drivers, what your router is etc etc.
Throw people a bone, they may fetch!
I have got a i7 6700k, GTX 1080, windows build 1809, all drivers up to date.
My router is a technicolor from a local ISP from my town with 100Mo download speed / 5Mo upload.
Basically the online part worked when I used another windows account. Then I decided to create my own account and buy the ultimate version. Ever since, I started the game from scratch but never been able to join Horizon Life normally available from Automn in the prologue.
What I checked and tried:
reinstalling the game a couple of times
reinstalling windows 10 keeping my files
made sure Teredo was fine and it is. All connectivities and NAT are OK whether it is from the control panel or the Xbox App
made sure the relevant Microsoft services are up and running
made sure my account is 18+, with no parental control and enabling the view on people’s creations, etc.
I don’t have Asus Gaming software or whatever it is called
my new account is obviously not banned
required ports are open in my router
no IPsec blocks in my router
windows update up and running
windows defender up and running
time is properly synchronized
tried to manually change DNS
tried connecting through my mobile network as a hot spot.
forza horizon 3 has no problem to join the online part.
Nothing has worked so far.
It worked just fine when the other account I used.
I wouldn’t mind starting over with a new account to try again but I spent 100e on my current one and can’t play online. It is incredible.
This is the only game I have been struggling that much with.
Who is your ISP?
Have you done any IPSEC passthrough settings for your router to enable it to communicate with the services?
Have you dressed in the official robes of ceremony and sacrificed a goat? (Don’t do this)
Haha not yet dressed up as a cultist. I might come to this soon enough.
My ISP is Orne THD, a [Mod Edit - Abbreviated profanity, profanity and profanity that is disguised but still alludes to the words are not permitted - D] local provider that is the only one setting up Fiber. I must say that it works quite good all in all.
Anyway I checked in my router and the only option where IPsec is mentioned is enabled.
But as I said, without touching anything (not even opening the ports) it used to work. But not with the account I am currently using.