why aren't my scarlet runner beans setting beans?

This happened last year also...they finally made some beans later in the summer.

This year they've been blooming for a long time and still no beans.

This is localized seed grown by a friend for years, he's gone now so we are unable to ask him questions about his beans.

Those I've shared scarlet runner beans with have a similar experience where they bloom for weeks without setting beans...then bear some late.

Our green beans are producing well and my long beans are setting beans.

I also don't see any pollinators on the scarlets and I thought those bright blooms would attract everybody.

attached photo from a month ago....now they are up over the trellis and have been blooming steadily since then.

Try misting them with water every evening. Disclaimer, I haven't actually looked into this properly, so take it with a pinch of salt, but the theory is that they are from a misty/foggy region, so I've always been told that they need it. Maybe they just need a little more moisture at the roots, so spraying them with a hose does that. Or maybe the first few never set. I grow them nearly every year, and in my experience,  the first few flowers never set, but by the end of the season they are hugely productive.

I'm keen to see if anyone has good tips on getting them to start setting sooner.

found a good explanation written by Joseph Lofthouse in this thread https://permies.com/t/53665/Growing-runner-beans-Portugal#439651

I might add a shade cloth to my trellis....

I thought the beans might already be adapted to this area since our friend grew them in similar conditions but he might have been able to plant earlier and in a semi shaded location.

thanks Ali!

I could try that with a watering can...thanks.
We've had more rain than usual for june but it's also been very hot.