It appears that S&P Ratings data is not flowing via the Eikon API, see code and resulting df:
CUSIPS = ['002824BF6', '00724FAC5', '001055AM4', '037833BY5']
fields = [ek.TR_Field('TR.FIIssuerDescription'), ek.TR_Field('TR.ADF_COUPON'), ek.TR_Field('TR.FIMaturityDate'), ek.TR_Field('TR.YieldToWorstDateAnalytics'),
ek.TR_Field('TR.FIIndustrySector'), ek.TR_Field('TR.FIPricingMidPrice'), ek.TR_Field('TR.FIWorstCorpYield'), ek.TR_Field('TR.FIAccruedInterest'),
ek.TR_Field('TR.FIWorstAverageLife'), ek.TR_Field('TR.FiOptionAdjustedDuration'), ek.TR_Field('TR.OASAnalytics'),ek.TR_Field('TR.FiSPRating', params = {'SEG':'G'}), ek.TR_Field('TR.FIMoodysRating'), ek.TR_Field('TR.FiSPRank'), ek.TR_Field('TR.FiMoodysRank')]
dat = ek.get_data(CUSIPS, fields = fields)[0]
dat
Any suggestions?