O Grill 100 from CW Help with hose for 20lb tank

I have a O Grill 100 purchased from CW, works great on small cylinders. When I bought it in Sept I purchased a Mr Heater f273703-60 5 ft hose for use with my 20 LB tank.

I can not get it to work with the larger tank. Yes, there is gas in the tank. O Grill website is no help. Looked on CW site again today and this is the hose they say I need.

I read that you need to wait a few minutes for hose to fill up before trying to light it. I hooked it up yesterday and waited 15 minutes, no light up. Worked fine again on my small tank.

Short of a bad hose, which I would think would not be likely, only thing I can think of is there is a problem with my 20lb tank. I am going to try the one on my big gas grill today. Other than that I am at a loss.

Any suggestions? Grill has been used only 1 week so connections are clean and like new. Hose is new. Tank has gas and fitting opening has been covered so clean.

Thanks in advance