All Rise's main character is Black and she's married to a Black man. But hubby is rarely on screen.
grown-ish has had Zoey in a long-term boomeranging triangle with two different Black guys, and there have been other all-Black couples on that show, too. They're all college students and they've actually made it a plot point that one of the other Black characters is dating a white guy, which breaks her rule of only dating Black guys. She thought he was light-skinned when she first started seeing him, and then she liked him and wanted to continue but it was a big fraught deal.
Malika on Good Trouble is dating a Black guy. I just remembered that one. I wonder if it varies by network, because GT and g-ish are both on Freeform, IIRC.
I'm not disputing the point, though, that there are not a lot of POC same-race couples on tv right now, especially among leads. It's a bit ridiculous.
I think Dr Andrews on The Good Doctor is married to a Black woman, and they had a storyline in a previous season, but it was blink and you'd miss it, and I can't even remember her name. So that hardly even counts.
Terry on Brooklyn Nine-Nine has a Black wife, but she's only really turned up a few times, and is mostly only mentioned in passing.
ETA: Black Lightning! BL himself and his wife are both Black. And one of their daughters has been in love with a Black kid her age since the show began, though it's got issues because the show keeps killing him, reviving him, making him evil, etc. But it's true lurve in the starcrossed superhero universe, fwiw.