@jagodachudzik -

Here’s the advice from the associated Miro Help Center article on assigning Admin rights (https://help.miro.com/hc/en-us/articles/360022251439-How-to-assign-Admin-rights)

Our Admin left the company and I want to get the Admin rights. What should I do?
- Contact your IT Department and ask them to grant you access to the email address of the previous Miro Admin. Once you gain access to Miro Admin's email address, change the password, sign in to Miro with Admin's credentials, and grant Admin rights to yourself in the Settings > Active users. This way you will be able to get admin permissions. If that does work for you and your account is on one of our paid plans, you can contact Miro Support and send us a paper with the signature of the officer of your company confirming the transfer of Admin’s rights for the account in question to you.

Kiron

@jagodachudzik - If reactivating the email address is not an option and you are using Miro's Free Plan, you could create a new Free Plan team and move all of the boards and teamebrs to the new plan - steps on how to do this can be found in this post: https://community.miro.com/miro-labs-113/taking-back-control-of-your-free-plan-team-7706