Mortar bee pollen?

Can anyone identify this, please?
There is an accumulation of 50+ of these yellow-brown pellets a bit bigger than a match head and very crumbly. The
y are below and in the frame of a Velux window where a bee is buzzing round. It could be a mortar bee but I am not sure.
My wife is quite phobic about bees so, if this is the issue, I would like to encourage it to move further down the roof line away from this window that we like to open. Any ideas, please?
There is an accumulation of 50+ of these yellow-brown pellets a bit bigger than a match head and very crumbly. The

My wife is quite phobic about bees so, if this is the issue, I would like to encourage it to move further down the roof line away from this window that we like to open. Any ideas, please?
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Can you see where they are nesting? Could you cover the area with a thin bit of metal or plastic to discourage them from returning? Maybe put more suitable accommodations for them at the far end of your garden instead? Bee hotels are easy to DIY.