if the stood up provider got ahold of him he's probably be black and blue balled.

8o)

Your regional board. It is good to get the message out to your fellow hobbyists.

"i'll make it up to you next time". FTS! Just puts more money in her pocket and rewards bad behavior.

A provider has stood me up twice. Left me waiting outside her incall.
Should I report it in a review or other place? If so where is the proper forum to report a no show?

She has good reviews and offered to make it up to me but only this week. A similar promise was made the first time.

I know if a guy no showed twice he would be blue balled.. What to do?

And don't fall for that garbage anymore.  One time happens to all of us...but to go back for that second one...that's on you!

Emergencies do come up.  However, leaving you sitting  outside her incall is extremely rude.  If, the first time, she was at the hospital for herself and could not contact you, its rude but understandable.  Sometimes it cannot be helped.

BUT TWICE.....

That is inexcusable.  Sorry that happened.

In case you have any doubts....  Move on.

The first excuse was her father was at the hospital. Second time she took a sleeping pill and did not wake up.
I felt she could have called or texted.

I am moving on. But I have seen what providers do to guys, just pisses me off don't want a fellow gent to get the same treatment!

Some girls...  I use the word 'girls' intentionally...  use the early bird business model.  They accept all propositions.  The first to arrive, she takes in, shuts her phone off or no answers until she's available again.  Essencially no such thing as an appointment.  It can leave multiple guys circling the block of her call location, until they give up & go home.
Then again some are just flakes or do not take their business seriously.
 
I watch carefully for any hint of this.  I do not care how hot she looks or how tight her kitty is, NO WAY, I'm going to drive there & be stood up.  Wasting my time, gas & opportunity...  
Emergencies happen...  Have happened to me.  Have happened to ladies I had confirmed reservations with.  But I do not believe in coincidences.  

Not quite this but recently a well reviewed lady stood me up with no call, did not take my calls.  If she had taken my call & said she couldn't make it, fine.  Instead, I wasted an opportunity.  She is OFF my personal bucket list.   I saved my donation & booked with a lovely lady a few days later, no drama & had a great time.
skb

Been there. Quite a few NCNS. That's even why I no longer take the time to shop for and bring "girly gifts". (I can't take them with me to save for another time 'cause I don't want to do any explaining, if you know what I mean.)

In some cases, there was no explanation or apology or follow up.

In some cases, there was a reasonable explanation (you know, like Reagan had explanations), an apology, but no offer to make things up. That has still worked out in some cases.

In some cases, there was great followup with extended benefits. That usually brings me back for more.

What to do?  Use your gut but the one you described sounds like "Fool me once, shame on you. Fool me twice, shame on me." I'd avoid the possibility of number three altogether.

In all three cases, I was contacted the following day with apologies, and various excuses.  One of those ladies offered the next visit on the house the next time she was in town: the other two I haven't yet seen, but have reason to believe to would do something similar.  

As for reporting this on the boards, it's best to resolve the issue privately.  Unless you have standing on the boards equal or surpassing hers, you will ultimately lose if you take things public.  Her other clients will find reason to attack you, and you may end up on DNS lists, or getting blacklisted.  Reporting a NCNS under an alias is of limited value at best.  Best advise: Chalk it up, and move on.