Whitelist Mint directly from Polygonscan

[ClydeMaster]

Hi All!
The Minting Dapp from the Masterclass is working perfectly. But when you do not have MetaMask you should be able to mint through Polygonscan/ the contract directly. I ran a Whitelist competition and some winners do not have Metamask. So I tried myself to mint on Polygonscan. But it's not working. I get the errors in Metamask. I know I have Metamask, but it should be possible to mint aswell with Metamask directly on Polygonscan and through the contract.

I insert my wallet addres here in the Dapp:

I get an approval:

On Polygonscan:
I am in the writing tab, Wallet is connected, contract is verified.
Whitelist mint price is 0 Matic + gas.
I insert the Merkle Proof here:

Metamask says: We were not able to estimate gas. There might be an error in the contract and this transaction may fail.
There's a button "I stll want to proceed". If I click on it, the transaction is pending and in the end it gets refused.

Has anyone here an idea how to solve this problem?
Thanks a lot in advance!!!

[ClydeMaster]

Update! I think this is a bug.
I contacted Metamask. They said it is defenitely an issue with the contract. I increased gas fee. And received the following error on Polygonscan:

Can you please help? My Whitelist winner cannot mint! Thank you in advance.

[ClydeMaster]

UPDATE! It took me 2 days to find out that the problem is linked to Firefox. Unbelievable. With Chrome everything works just fine. Maybe this hread is of some help for others at least.