unable to allow uniswap to use my tokens

hi everyone. I have annoying problem. I moved some uni tokens to arbitrum to add liquidity on uniswap but I can't swap them. Everytime I click on the button to approve for spending (button is blue) nothing happens and swap button stays grey. I have only a dust of eth but that shouldn't be a problem at that stage I suppose. I tried it on win, mac, brave and chrome with no effect. is it something I do wrong or what. I'm not a pro neither a rookie either way I can't beat it any advice? cheers