Sunset
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So I bonds have limit of 1 per SSN. If I already own one under my name/ssn, can I open another as Joint owner with my daughter as Primary and me as Secondary ?
Your daughter can buy one. She will own it. She can add you as a POD/TOD.
Either by: the second-named owner or beneficiary. But you don't own it as second-named owner, it just takes effect upon daughter's death.
But I don't think (I'm NOT an expert) that anyone can have a Joint bond that has the meaning of a regular CD.
https://www.treasurydirect.gov/indiv/research/indepth/ibonds/registeringibonds.htm