If you want to share access to your Meross devices with others, there are several ways to do so:
For the Meross app, simply have the other person log in using the same account on their phone.
For Amazon Alexa, you can follow the steps in this article: https://www.pcmag.com/how-to/let-multiple-people-use-the-same-amazon-echo
For Google Home, you can follow the steps in this article: https://support.google.com/googlenest/answer/9155535?hl=en
For HomeKit (HomeKit-enabled devices only), you can follow the steps in this article: https://support.apple.com/en-us/HT208709