Re-sequence cannot start until all re-sequencing rails are below the POWER_GOOD_OFF threshold. Make sure that all re-sequencing rails are off properly.
For more FAQ please check the following document.
UCD90xxx Family Frequently Asked Questions and Answers
UCD9090 UCD9090A UCD90120 UCD90120A UCD90124 UCD90124A UCD90160 UCD90160A UCD90240 UCD90320 UCD90320U