Can the fix be posted publically? This will affect more than just 1 user.
[quote=aeyesi post_id=1009563 time=1687625330 user_id=213176]
Just used the intermediate certificate… Thank you for posting this!
[/quote]
You’re welcome! 
[quote=oskarsk post_id=1009180 time=1687430032 user_id=142909]
Could you please contact us through support portal, we have fix available for this. Thanks
[/quote]
Create ticket SUP-120254.
Just tested(via ProtonVPN) ROS 7.11.0 Stable on RB750GL and IPsec correctly working without intermediate certificate, although I don’t see direct mention of resolving this problem in release changelog >_>
Upd.
If you are still getting an error after upgrade, then remove the root certificate, re-import, and correct tunnels configurations where this certificate was used.
I had such problem on one of my devices(RB4011) and the described workaround helped.
Updated the existing ROS 7.9 to 7.11.2 and can confirm that the initial issue is fixed.
Thank you, devs.