Help with contract call overrides please

[White-Rabbit-7]

I am getting two values from a tx like so:

maxPriorityFeePerGas = tx.maxPriorityFeePerGas.toString();
maxFeePerGas = tx.maxFeePerGas.toString(); 

console.log(maxFeePerGas); returns 1500000010

I then want to use these later in a seperate contract call with overrides:

let overrides = {
  gasLimit: 230000,
  maxFeePerGas: maxFeePerGas,
  maxPriorityFeePerGas: maxPriorityFeePerGas,
}; 

I then do a call:
let tx = await contractWithSigner.BuyFunction('0x3e...','0xeb...','50000','10000000000','4',overrides).then((result) => {...

However these overrrides cause the tx to never go through, if I remove the above overrides the contact call works as expected. Also if I add them in manually such as maxFeePerGas: "1450000" it also works as expected, I am sure this is something very simple, so please excuse me for my ignorance I am new to this! It does not like my variables.

I thought perhaps there was an issue as they were a string, so I parseInt()'ed them, but that did not help. I tried hexlify but that also did not help.

[zemse]

However these overrrides cause the tx to never go through, if I remove the above overrides the contact call works as expected.

Does the promise doesn't get resolved or do you get an error, if so can you share that here?