I have a new Q990F installed and it is working well with the exception of Alexa… I installed Smart Things on my Samsung S25+ and the sound bar is recognised, so I can do all the usual things Device Control things.
However when I go to Service and click Alexa Settings, then Amazon Alexa and then Sign in it says “Loading…” and after ~20 seconds nothing… 
any ideas please? Thanks, Peter
I may need to be corrected on this but I think somebody told me that Alexa on sound bars and TVs cannot link to SmartThings. I definitely could be wrong. I have a V3 and V4 Echo linked to SmartThings.
I just removed my soundbar as it was glitching everything since I installed Alexa. It was a cheaply soundbar so I just removed it. All working perfectly now.
Hi I am also facing the same issue ..have you guys found any solution
I think it’s a big glitch..I found some unique device id for q990f soundbar..chatgpt suggest that firmware is from Kuwait and that it’s got blocked
I got the solution it’s resolved for me
Could you let us know what worked for you please?
Some progress, disconnected Alexa from my SmartThings Apps and re-authorised. Now SmartThings can see my Q990F and I can turn it off-on from the App, including through Google Home and Alexa.
However the Q990F is still not recognising voice commands. Spoke to someone from Samsung and they did not sound too surprised - waiting for a call back again to do more investigation.
Regards, Peter