A solicitor who gets probate does so on behalf of the executors and the estate. It is the executors' duty to distribute the funds to the beneficiaries. They can't withold money due to beneficiaries.
Any will, even a genuine one, is of no use and no worth until it has been admitted to probate.That means that tax due on the estate has been paid, all accounts prepared, the will proved valid and the Court has issued a grant of probate .
These fraudsters have cunningly said that they'll send you a copy of the will. That document will be false.It will show you to be a beneficiary. (These people have 'wills' for all occasions: they'll have one ready typed for every victim !) The victim , seduced by this, will then give their bank particulars.That'll be the last they hear from the fraudsters !
If this were genuine these people would have the grant of probate, giving particulars of the deceased etc. That would have an official stamp and would be accompanied by the will. It and the will are public documents which anyone can see and you could then check. The fraudsters, obviously, won't have one of those ! The executors (or the solicitors on their behalf) having the grant of probate would only write to establish your address and, if necessary, that you are the same as the person named as a beneficiary in the will. Then they'd send you a cheque.They would not normally need your bank particulars in any case.