An odd one! If you can start a thread here then you have the rights to start a thread in the Alfa section. Hopefully someone else will be along who has an idea.
Thanks for reporting this. This is an intermittent error that affects a small number of new members, so please persist or try posting through an incognito window.
I am having the same issue - and only joined earlier today Could there be a housekeeping routine that runs every day / week that indirectly resolves the problem?
I am also getting 'validation failed'. Even with a one word test message. I sent an email, about the problem, to info@pistonheads.com yesterday. No reply yet. I joined on 16 Oct and wanted to start a new discussion on the Watch forum.
Unfortunately this does only affect a very small number of new members and will last for the first 14 days since you signed up. Apologies to any new members experiencing this and for the inconvenience caused.