Dual Vanity Sinks Not Draining: New Install

[Amy Mitchell]

Hi there
In the middle of a bathroom remodel and we have installed a vanity with dual sinks. There is venting to the roof, and the sinks share one drain via (i think) a sanitary T. When one sink is used, it drains fine. However, if you fill both sinks up with water at the same time, they will not drain. Can anyone help me figure out what might be wrong? Seems like an air trap or something.
Pretty sure the slope of the newly installed drains is OK....vent is still venting to the roof. Im stumped. And really dont want to rip the wall open again...

I am wondering if the san t is causing an air pocket? Or if the P traps are too shallow.
Any info would be greatly appreciated

*** they are undermount sinks, with overflow holes

 

[Plumber69]

My guess is cause you have installed vessel sinks. Take a pic of the sink drains from above

 

[Sponsor]

 

[Amy Mitchell]

My guess is cause you have installed vessel sinks. Take a pic of the sink drains from above

thanks for the reply! they are undermount sinks, with pop-up drains and overflow holes.....
I just added another picture of the almost finised vanity

 

[Reach4]

Try lifting the pop-up out, and see if the drain takes water quickly then.