unable to encrypt a file with recipient as any string (example : 918A6B32) instead of email.

[npnaidu206]

When we use below java snippet , it works for recipient as email but does not work for any random string.
BouncyGPG
.encryptToStream()
.withConfig(keyringConfig)
.withStrongAlgorithms()
.toRecipient(recipient)
.andDoNotSign()
.armorAsciiOutput()
.andWriteTo(output)
** System (please complete the following information):**

• OS: container as Linux
• Java : 17

throws exception :"org.bouncycastle.openpgp.PGPException: No (suitable) public key for encryption to 918A6B32 found\n\tat name.neuhalfen.projects.crypto.bouncycastle.openpgp.BuildEncryptionOutputStreamAPI$WithAlgorithmSuiteImpl$ToImpl.extractValidKey(BuildEncryptionOutputStreamAPI.java:414)\n\tat name.neuhalfen.projects.crypto.bouncycastle.openpgp.BuildEncryptionOutputStreamAPI$WithAlgorithmSuiteImpl$ToImpl.toRecipient(BuildEncryptionOutputStreamAPI.java:431.

Where as it works for command line :
gpg --output /tmp/outputfile.txt.pgp --reciepient 918A6B32 --encrypt textfilePath

please let me know if it is issue with bouncy gpg issue ?

thanks for your help. looking forward for reply

[npnaidu206]

using
name.neuhalfen.projects.crypto.bouncycastle.openpgp
bouncy-gpg
2.3.0