When you switch sensors around or put the spare on it will need to learn its position. Drive it around if you havent. Since you were towing the Jeep wasnt on so it couldnt. If it still isnt acknowledged then Id look at the woring around the affected wheel(s).
2015 Red JKU Rubicon RK X-factor, Adams, Rockhard4x4, PSC, LoD, BFG, WARN
SOLD 2013 JKUR
Sold 2005 Rubi Unlimited
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2004 TJ sold
1993 YJ sold