If you notice after subscribing that one of your users is locked out, this means that you are beyond your maximum number of users for the plan you purchased. Locked out users cannot access your account.
To verify whether a user is locked out, look for a "lock" symbol next to the user's name by navigating to Account > Manage team. The top of your team page also indicates the number of users remaining:
You'll have zero users remaining if you've identified a locked user. To unlock a user, you can either remove an existing user, or you may edit your current plan to purchase additional user slots.
Remove & replace a current user
If you'd like a locked user to regain account access while keeping the current number of allotted user seats, you can delete an active user on your team page to make space for the locked out user.
To delete an existing user:
Head to Account > Manage Team.
Select Remove from the dropdown menu to the right of the active user's name:
Purchase additional user seats
You can also add more users to your plan for just $5/user per month ($60/user/year).
At the bottom left of your account, head to Account > Settings.
Click the purple Manage button.
Select Change your plan, then click the purple Edit Plan button.
Update your current plan to include the desired number of users. E.g., if your account has 3 users, but you'd like space for 2 more, select "5" user seats from the dropdown on the checkout page.
Click Check out.
Note: At the time of check out, you will only be charged the prorated amount for any seat(s) you purchase through the remainder of your current billing cycle.
Once your plan has been updated to increase the amount of users, your locked out user can log back into your account again!
Contact Us 
If you have any questions about unlocking users or updating your team, get in touch with Instrumentl Support via the chat bubble when logged in, or email us at hello@instrumentl.com.