this reward started from 1 april 25.
under TnC
https://www.uob.com.sg/web-resources/personal/pdf/personal/save/common/terms-and-conditions-savings-promotion.pdf?adobe_mc=MCMID=90336753668894115379188975927237221272|MCORGID=116168F454E6DA2A0A4C98A6%40AdobeOrg|TS=1746324889, clause 2.4: if you satisfy all of the requirements set out in these Terms and Conditions and your Participating Deposit corresponds with the amount stated in the Participation Form you submitted, you shall be eligible to receive a
one-time cash credit (the “Cash Credit”) corresponding to the amount of your Participating Deposit as set out in the table below..
So if you have claimed already this particular reward (UOB Cash is King Savings Bonanza) using a different account ( say a UOB one account), u can't be eligible again.
If you never participate in this reward, then you are ok (provided you meet all other requirements).