best response confirmed by Johannes_Riemer (New Contributor)
Solution
Hello, I'm afraid that's not possible. The inviting org. should enable OTP which is being rolled out as default right now actually (will take some time though) https://docs.microsoft.com/en-us/azure/active-directory/external-identities/one-time-passcode#enable...

Here's the flow you're experiencing all the way down to the account creation https://docs.microsoft.com/en-us/azure/active-directory/external-identities/redemption-experience#in...
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