Universal Messages: Dark grey bubbles. How are they different from blue and green?

[EugW]

My cell provider provides customer support via Apple Messages as an option. However, the messages I send are dark grey, not blue or green. What is the significance of the dark grey bubbles?

 

[BigBlur]

It means it's using Messages for Business.

 

[EugW]

It means it's using Messages for Business.

Ah thx. I wasn’t aware of that.