My apple ID is locked out because of 2-step verification-Recovery key is not being accepted.

All my Apple Devices are locked out of my Apple ID.

My devices:

1. Imac--Mid 2014-Processor 1.4 GHz Intel Core i5-8 GB 1600 MHZ DDR3

2. Iphone -6--ModelMGAF2LL/A

3. Ipad-2---ModelMC764LL/A

4. Macpro--Model 1,1 running Lion 10.7.5

All my devices are locked out of my apple ID because of 2-step Verification. The Recovery Key is being rejected but there is no other Recovery key.

Is there another way of recovering my apple ID?