How can the owners of a company revoke actions made by previous owners?

Dear Sir/Ma'am,

The previous owners of a company in the UAE granted a POA (on behalf of the UAE Company) to a foreign partner in KSA to open a company in KSA.

Now the owners of the UAE company have been changed. Do all previous owners have to sign if the company wishes to revoke the POA or the current owners can sign for revoking the existing POA issued on behalf of the company?

Please advise.