When you have a personal membership you are only allowed to be logged in at 1 device at the same time.
Please consider changing your membership plan.
If you have an educational membership plan you are allowed to be logged in at 5 devices simultaneously, restricted to 1 IP adres.
If you have purchased a hospital membership plan you can logg in with 10 devices simultaneously, without an IP restriction.
If you have purchased a correct membership plan and still encouter problems please
get in contact.