did you ever figure this out? I have the exact same problem. Contacted vBulletin for info since there is none to be found on Google and they just directed me back to this forum where this is the only thread I see with a similar issue. I get a successful login for a user, I get a session hash, I pass it with the next call and it fails with this error. Here is my full log from my script:
** 12/03/2020 21:48:05 submitting to https://9fb85c2cade8-042204.demo.vbu...api/user/login
** 12/03/2020 21:48:05 Post data is array (
'password' => 'labrat1234',
'md5password' => 'e497db5dcf836587ef35a974ee2fd8d7',
'username' => 'labrat',
)
** 12/03/2020 21:48:07 login response: '{"sessionhash":"8bfb07dea2776d52f510bb74595a9207" ,"userid":"3","password":"27b8a3afd7e70359a839b652 ccda58be71709612cd1dc7ec9ad7dec4","lastvisit":"160 6940634","lastactivity":"1606940580"}'
** 12/03/2020 21:48:07 Logged in Successfully
** 12/03/2020 21:48:07 Attempting signature edit...
** 12/03/2020 21:48:07 submitting to https://9fb85c2cade8-042204.demo.vbu.../saveSignature
** 12/03/2020 21:48:07 Post data is array (
's' => '8bfb07dea2776d52f510bb74595a9207',
'signature' => 'testing signatures',
)
string(52) "{"errors":[["no_permission_logged_out"]],"userid":0}"