I don't know if this has been reported, but the magnificent armor (all objectives fully completed) no longer glows white not the transmoged or original armor, I figured it was just something that may be updated with solstice 2022 but the glows are still broke It was one of my favorite Titan sets I hope this bug is something that can be fixed.
(Edited to add clarity)
you have to fully upgrade the armor so that it glows white
When you have fully upgraded a piece of armor it will light up white
For that you need to complete the Solstice Challenges
In order to have all armor pieces glow white, you must complete all 24 Solstice Challenges and then upgrade all armor pieces
Your Titan Helmet, Gauntlets and legs are not fully upgraded and therefore not glowing
That is normal