# MetaMask

**Published by:** [sahe](https://paragraph.com/@asyncmusic/)
**Published on:** 2022-05-08
**URL:** https://paragraph.com/@asyncmusic/metamask

## Content

When you go to add another Mainnet RPC endpoint, you may see a message stating that the Chain ID is already in use by the Mainnet network. Since you do in fact want to add a new Mainnet network, click “Save” and it will work.

## Publication Information

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