AFAIK, Microtik does support IKEv2, so I’ld suggest using IKEv2 instead of the much older IKEv1.
Using old docs or very old protocolls CAN result in a non-working VPN, simply as newer devices don’t support and risky encryption like 3DES anymore.
Besides which, why a VPN when anyone can read it?
My 2 cents
Andy