Cause
This is a common occurrence with the Polkadot.js Wallet. It occurs because your extension metadata is out of date, so the extension doesnt know subspace testnet exists.
Fix
- Make sure Polkadot.js extension is installed and ready to go.
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Go to the Subspace/Polkadot Explorer here: Polkadot/Substrate Portal
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You will be prompted to allow the extension to connect, click
Yes, allow this application access
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Click
Settings
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Click
Metadata
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Click
Update metadata
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You will get a popup from the extension asking you to confirm click
Yes, do this metadata update
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You will now see
Subspace Testnet
as an option on the “Allow use on any chain” dropdown.