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I'd start with that number. If you're not in the right department, you'll either get transferred or you'll be given another number to call.
Normally there is a sticker right on the card itself with the activation information. Mine had one...
Whoever was stuffing envelopes that day must've forgot to load up a roll of stickers into the machine!
Total Cards: 24 | Total Limit: $304,250
Current FICO 8 Scores: EQ: 841| TU: 815 | EX: 814
Hard Inquiries: 1
discovercard.com/activate